I love the Accubond. I shoot it in a 300 Ultra and I am using IMR 7828, but looking on Steve's pages http://stevespages.com/page8c.htm he shows for the 300 Weatherby; RL-25 From 77.0 grains to 85.0 grains Federal 215 Primer. Hope this helps [img]/ubbthreads/images/graemlins/laugh.gif[/img]